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Definition of rigorous:

  1. Manifesting, exercising, or favoring rigor; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.
  2. Severe; intense; inclement; as, a rigorous winter.
  3. Violent.

Synonyms:

smashed, trying, cockeyed, mean, honest, hard, stringent, backbreaking, tight, crocked, squiffy, exact, heavy, real, nonindulgent, mingy, brutal, taut, slopped, faithful, unyielding, demanding, unkind, sloshed, onerous, rough, unrelenting, true, laborious, soused, cruel, soaked, nasty, fuddled, besotted, veridical, usual, effortful, plastered, close, miserly, dogmatic, blotto, weighty, morose, exigent, hard-and-fast, loaded, sozzled, formidable, burdensome, pixilated, wet, arduous, errorless, blind drunk, strict, veracious, taxing, full, pie-eyed, harsh, unmitigated, stiff, pissed, tough, difficult, compressed, inexorable.

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